Soldering iron



FIG. 1 is a side elevation of a soldering iron in accordance with the present invention, the opposite side being a mirror image thereof;

FIG. 2 is a top plan view of the soldering iron of FIG. 1;

FIG. 3 is another side elevation of the soldering iron of FIG. 1 taken from the right of FIG. 1, the opposite side being a mirror image thereof;

FIG. 4 is a bottom view of the soldering iron of FIG. 1. 

The ornamental design for a soldering iron, substantially as shown and described. 